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Old August 31st, 2013 (7:50 AM). Edited September 1st, 2013 by xGal.
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xGal xGal is offline
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Join Date: Nov 2011
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Not much to say here... This is a tutorial on editing the .S file... Yup, the mysterious .S file that contains MIDI music's data!

Let's start!

Changing Speed
Spoiler:
If you use Anvil Studio, like me, you might've noticed that there's a speed limit of 300, but you've seen some music that their speed is over 300. Example: Vs. Turner (Pokémon Vega [510 speed lololol]). This is how you do it.

Open the .S file in notepad and search for the following:

Code:
    .byte    TEMPO , X*M_tbs/2
Where X stands, put the current speed and where the M stands, put the name of the .S file (example: if the name is battle.s, I will change X to "battle").

Now, to edit the speed, replaceX with the speed you want.


Changing Volume
Spoiler:
This one was found by Team Fail, so credit him!

If you once imported a MIDI from a DS game, you might noticed it didn't play in-game. It's because the music is too loud for the GBA to play.

Find the following:
Code:
    .equ    X_mvl, 127
Replace X with the name of the .S file.

Now, replace "127" with the volume you want. I recommend to set it to 79.


Changing an Instrument
Spoiler:
Navigate to the start of the track and find the following:
Code:
    .byte        VOICE , X
Replace X with:
Code:
Current instrument -1
Replace it with:
Code:
Instrument you want it to set to -1


MIDI Events
Spoiler:
Program Change
Spoiler:
Write the following in the position you want the program change to start:
Code:
    .byte        VOICE , X
Replace X with the instrument you want it to set to -1.


Panpot
Spoiler:
Write the following in the position you want the panpot to start:
Code:
    .byte        PAN   , c_v+X
Replace X with:
Code:
0 = Left
64 = Middle
127 = Right


That's it, FOR NOW!
Ten Sho Sho Ten Sho
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